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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da08448a365f7cad22948f1db20ea753ad8f76c313299af968da655b3a84da78' 
  AND token = 'uSuwDCcvn8twT6ut/+Ajv8Z5efb5lMBRMg7c4jT4MqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}